Electric heater.



H.- W. '.DBNHARD. ELECTRIC HEATER. APPLICATION FILBDJULY 117, 1908.

15.121,074, Patented Dec. 15,1914.

UNITED STATES PATENT oEEIoE.

HARRY W. DE'NHARD, 0F SAN FRANCISCO, CALIFORNIA;,.`ASSIGNOR, ZYMESNE ASSIGN- MENTS, TO THE CUTLER-HAMMER MFG. C0., A CORPORATION OF WISCONSIN.

ELECTRIC..

specification tr Letters ramt.

Patented Dec. 15, 1914.

Application led July 17, 1908. Serial No. 444,059,

To all wiz-om it may concern.' E

Be it known that I, HARRY W. DENHARD,

a citizen of the United States, residing atv tain new and useful Improvements in Elec- CJI tric Heaters of which the following is a specification'.

My invention is a modication of the form of electrical water heater shown in an application filed by me on the 24th of lJune V 1908, serially numbered 440371. In this application I have shown a closed chamber containing a series of electrodes'with spaces between them and out of electrical connection normally, the connection between the positive and negative electrodes being made by iilling the spaces between the electrodes with liquid as bythe filling of the chamber.

The present invention is a modification of the device of the application and cornprises an open bath with a series of electrodes arranged therein in sets, the sets being insulated from each othenbut being so arranged within the bath or receptacle as to be surrounded by the water or other liquid filling the same and offering a resistance .between the positive and negative electrodes so as to cause a heating action as the curl rent passes from one ,electrode to the other through the liquid. Instead of the closed chamber, as in the application referred to,

I adapt 'the inyention to any form of open receptacle, and this may be made in avai riety of shapes, and used for many pur- In the drawing, Figure 1 is a sectional adapted. It may' be ornamented in any suitable or desirable manner in case it is' in.- ended for use on the table 1n the heating of liquids in the preparation of food. Eir-A tending across froin one 'wallto 'another are a series of electrodes which may be 1n two sets of three each as shown, or in any suitable number according to the particular requirements. These electrodes are valter-.-

Y nately arranged, A, B, C, being positive and" D, E and F negati Je electrodes. The electrical connections are shown at 15. The electrodes of the lpositive series. arefsupported at the left hand side by rubber gas'- kets S, and at thexright hand side in recesses inthe. walls of the porcelain receptacle,

while the electrodes of the negative set are reversely arranged. Thus there is no direct electrical connection between the electrodes,` and there can be no passage of the current until the electrodes are submerged and the spaces between are filled with water or other liquid. In the passage of 'the current Ithrough the resistance oliered by the water heat is generated and this liquid contained within the receptacle heated very rapidly. When there is no liquid' within thereceptacle there is of. course no action and no burning out of the parts.

What I claim is z- .1. Iny an electric heater; thecombination of a receptacle having -vertieal walls, electrodes submerged within a liquid therein and passing through said Vertical walls,

means for maintaining a Water tight joint ceptacle and extending through the vertical walls thereof,- means for maintaining a water tight joint about each electrode and Y electrical connections for said electrodes at the-protruding ends of the same.

3. An electric heater comprising a receptacle having openings in its walls on opposite sides and recesses opposite each 'open-V ing, gaskets in cach opening, electrodes each having one end passing through the openings and the other seated in' the opposite recess and electrical connections for said electrodes.

4. An' electric heater comprising an open receptacle havingopenings in its wallsn opposite sides and recesses lopposite each opening, rubber gaskets in each opening, and electrodes each having one end assing through the gaskets and its other en seated inthe opposite recesses.

5. An' electric heater comprising a receptacle, vpositive and negative electrodes exbending across the same and having both ends supported in the walls thereof, the ends V o the positive electrodes extending through l@ l withv said openings and a plurality 'of alterthe walls'on one side and the ends ofthe negative electrodes extending through the Wall on the. other sideV and electrical connectionsor said electrodes.` f

.6. lAn electric heater comprising a receptacle having openings in its Walls and recesses, in its opposite walls in alinement nately arranged positive and .negative electrodes extending, through said openings and into the ,'recesscs, said' positive and negative electrodes 'extending into said 'receptacle strom opposite sides thereof.

7.V ln an electriejheater, the combination .of` an open receptacle havinga flange ,around its periphery, electrodes extending through the walls of saidv receptacle, and means located beneath said Harige maintaining a water tight joint abouts'aid elec- K trodes.

v 8. ln an electric heater, the combination of a receptacle having a transversely eX- tending iiange on its periphery, electrodes :extending through the walls of said recep-v tacle, means surrounding the lends of said electrodes and located beneath said flange for maintaining a'water tight joint between the electrodes and the walls of .the recepparellel vwhereby free circulation of said liquid is permitted, said grid being arranged in' a horizontal plane to insure immersion of the entire grid in a given depthyorl liquid;

l0. ln a device of the' class described, a shallow, open liquid receptacle of insulating material, electrodes in the form of conducting rods each supported at opposite ends in the walls thereof, whereby they are insulated rom each other, said electrodes being spaced apart, arranged. horizontally and ""'ach otherin the form of a grid, one `en 'if eachV electrode protruding through itsl` supporting wall to provide a terminal 'connection outside of said recepy tacle. y

In testimony 'whereof I have affixed my signature in the ,presence of'two witnesses this lth'day of June, 1908.

HARRY w. DENHARDL Witnesses:

FRANK L. OWEN, A. DIXON. 

